DIY Car Painting Techniques – Spray Gun Overlap For Applying Paint Coatings


My name is Donnie Smith. And in this video,
we’re going to talk about using the
correct spray overlap. I’ve got some
spraying tips for you. This video is going
to be about overlap. Overlap is how much you
overlap each layer of paint that you spray. And first, to
start this, we want to get our gun set, get
the air pressure set. And we’re going to use
a full, wide pattern for this demonstration. And I’ll show you what overlap
is, and we’ll talk about that. But before we get started,
let me explain a little more in the classroom. I just wanted to expand
on overlap a little bit and kind of talk
about what that is. You should have seen
that we had a pattern. You know when you’re
doing a complete panel or a complete car or
something like that, you’re going to have a pretty
wide pattern, maybe about 12 inches. This is the top of your
pattern, and this is the bottom. So if you’re going
to overlap this 50%, you’re going to come right
to the middle of that, because that’s half of it. You’re going to overlap it half. So the next pattern is going to
be right here, and come down. The next one will be right here. So each passage you go, you’re
going to overlap it 50%. Half and all the way down. That’s how you’re going
to get the overlap that certain paint’s requiring. Now, most of your
solvents do require 50%. That’s what they recommend. You get into
waterbornes, they’re 75%. So if this was 75% and
this is our pattern here, here’s half, here’s quarter. So we’re going to
overlap it 75% each pass that we’re going down. Now, when we talk
about a coat of paint, you pass it one time
and overlap 50 or 75 or whatever, come down,
air up, whichever direction you’re going. And that’s one coat. You don’t want to
come down, then come back up, then back down. You know, that’s going
to cause other problems we’ll talk about later. But one coat is whenever
you gave it each pass down the panel at 50, 75, or
whatever’s recommended. Some of your candies,
you know, they also require more of an overlap. If you have something
like this and they’re barely overlapping on
the ends, you know, that’s not going to
get the required mils that the manufacturer’s
asking for. It’s going to be light mils and,
you know, could cause striping and, you know, just
cause a lot of problems. So just get in the habit of
overlapping each pass 50%, 75%. Probably for most
of you, it’s going to be 50% because of
[? thin ?] solvents. The primers we use
here are solvents, the clears we use are solvents. And we do have waterborne base. We do both waterborne
and solvent. OK. Now let’s show you a
little bit more about it. First, I’m checking my pattern. Got a good, wide pattern. And we’ll check
that a couple times. And now you can see that
the pattern– you know, the top and bottom,
see the middle of it. The middle of it is where you
want to make your second pass. Then the middle of
that one is where you want to make the
third pass, and so forth. Now we’re going to
talk about edges, the top and bottom edges. You want to overlap,
get 50% of your spray off the panel when you
spray on an edge and 50% on. One more thing that
I showed in there and I want to be sure and stress
on, here’s a panel right here. You know, starting
the pass, you don’t want to be right on the edge. You want half of that
to be on and half off. That way, you’re sure you’re
going to get good coverage. Same on the bottom– half on,
half off when you’re finished. Now, that’s a good way to
practice and start learning. Now, when you become
really good at painting, you may start learning
techniques for efficiency, not to waste as much paint,
where you might cut some of that down and
things like that. But for now, half on, half off. In, half on, half off. And be sure and overlap
each one 50% as you go. And now I’ll
demonstrate like I’m painting the bottom of a panel. You want half the spray on,
and then you want half off. Now I’ll go ahead and spray a
fender and kind of demonstrate what it looks like
painting an actual fender. And notice that I’m doing each
pass, overlapping each one 50%. And I’m going all the
way down the fender back and forth to
get good, even coats. And I do one pass, and I
come back and overlap 50%, because this is a
solvent product. It’s a primer sealer
that I’m spraying here. And then I come back. And I allowed it to flash. And I’m putting
a second coat on. Again, I go the full
length of the fender, overlap each pass 50%,
and just apply nice, even coats until you get
all the way down the fender. And once you get a
coat on, you need to allow it to flash before
putting another coat on. The flash time may be
anywhere from 5 to 15 minutes in between coats. That’s it for this video. Thanks for watching, and
we’ll talk to you next time. [MUSIC PLAYING] [MUSIC PLAYING]

3 comments

  • Traveling Charlie

    I need your advise Donnie because in going to spray my car soon.

    I'm going to spray it a blue metallic, it's a little darker than Sky blue but not as dark as navy blue,

    technically "Arctic blue"

    Do you personally recommend a 50% overlap or a 75% overlap??

    Reply
  • charlie johnson

    Donnie. Is the master instructor…. I woyld like to see a vid..by Donnie that tells the tale of. The inportance of prepping a car… And the shop.. It takes many hours of prep b4 painting.a poor paint job,, comes frim poor prep.. Always keep these few steps in mind,, Clean Clean Clean. Dust ia a enemy. Bloxk block block,, tach rag dry fall bwtween coats, . And your a robot.. A little water on the floor while painting. Will help keep dirt out of your paint., and when toy put your base coat on and tou see the color,,. Check your work… If yoy see a defect … Stop painting. Let it dry. Block,out the issue and acuff the car and then paint. Shure you. May need to gwt a little more paint. But your finish ed job will be outstanding.. oh by the way one more thing. . im a novice like you. I learned most of these things from watching many of Donnies vids. Thank you Donnie for taking the time to do these vids.

    Reply
  • Guy

    Good video, well explained, painting the edges half on half off gives best results Thanks so much for this video.

    Reply
  • CHIDEX KOFI

    Boss you are the best u got me on this one….this has been my problem for long but now I think am good to go…because this video reveal everything to me

    Reply

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